Your breakage problem sounds like something I went through recently:

http://www.bikeforums.net/showthread...or-Explainable

Replacing the spokes, because I could do it myself, was the way to go in this case.

In your case, if the rim is even questionable, consider buying a new factory wheel. It'll be as cost effective or cheaper than building a wheel on an old hub and you'll have little reason to worry about future failure, especially if there's a chance that the hub design was contributing to the breakage.